Update to Node 22 (active LTS)

- See https://nodejs.org/en/blog/release/v22.11.0
- See https://github.com/wagtail/wagtail/issues/12531

.nvmrc

@@ -1 +1 @@
-20
+22

package-lock.json

@@ -14,7 +14,7 @@
         "stylelint-config-standard": "^34.0.0"
       },
       "engines": {
-        "node": ">=20.0.0"
+        "node": ">=22"
       }
     },
     "node_modules/@aashutoshrathi/word-wrap": {

package.json

@@ -4,7 +4,7 @@
   "repository": "https://github.com/wagtail/bakerydemo",
   "private": true,
   "engines": {
-    "node": ">=20.0.0"
+    "node": ">=22"
   },
   "devDependencies": {
     "eslint": "^8.55.0",